Selection of flow meters for sludge pipelines in wastewater treatment?

A wedge flow meter is a flow measurement instrument that operates on the principle of differential pressure. Used for measuring flow rate in liquid media containing solids such as mud, slurry, sand-containing crude oil, wastewater, heavy oil, and residue, as well as in fluids with low Reynolds numbers. Features: 1. The use of a “V”-shaped throttle element eliminates dead zones and prevents blockages in the system. 2. The Reynolds number has a wide range of applicability; even at a Reynolds number of 500, the relationship between differential pressure and flow rate remains quadratic. 3. The differential pressure transmitter can output a 4–20mA electrical signal, facilitating integration with various instruments. 4. Easy to install, use, and maintain. 5. High measurement accuracy; expanded uncertainty for flow calibration: ±0.5% to ±0.2% (calibrated with water or oil). 6. It boasts excellent long-term stability, and is praised by users as a meter with a zero-failure rate. 7. Split-type primary gauge; the range can be expanded by replacing the wedge element (in the middle)

For non-viscous fluids, non-standard throttling elements such as elliptical orifice plates are generally used in combination with differential pressure gauges or ultrasonic Doppler flow meters

For wastewater, it is best to use a measurement method that does not involve direct contact with the medium; electromagnetic flowmeters are the preferred choice； For large pipe diameters, ultrasonic flowmeters can be considered.

As a supplement, it’s also fine to use a wedge-type one; our gasification particle content is higher than yours, and we use this type of flow meter as well!

I agree with the opinion from the 5th floor. I have been working in the field of automatic control design for sewage treatment projects for many years, and based on my practical experience, electromagnetic flowmeters perform well – they offer high accuracy and require little maintenance. For large pipe diameters, an ultrasonic flow meter can be considered. For fluids with high viscosity, it is advisable to use instruments without throttling elements.

Ruru asked: Do ultrasonic and electromagnetic flowmeters require the pipeline to be in a straight section?

Five first, three last； For general wastewater measurements, very high precision is not required

The ENV200 ultrasonic sludge concentration meter from Korean WESS can measure both sludge concentration and flow rate? Can it be applied? www.wessglobal.cn

What if organic sludge is non-conductive?